Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd070db8622dbc31…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 15:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6bd9eb6a38bf1416163ef4d77b8bc5b9 SHA-1: 35629bcbd2d2b821b196b5d8c4599d9842205de0 SHA-256: dd070db8622dbc31fe1d191801d0a9c40ed5f341c940796cba083881f2339f8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. Multiple heuristics indicate the PDF contains numerous links pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The presence of external URIs and link farm patterns suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=repost+getter+apk PDF link annotation
    • https://plentis.eu/ckfinder/userfiles/files/wovilaxanalafitev.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/51929580103.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135886310bbc---junejugewarazutatuditus.pdfIn PDF document text
    • http://opsir.eu/files/file/rilumijevokukitib.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/33684582102.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/mupabuburetagufip.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/jotawurego.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/dijugewegosuvitijojakes.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/morokez.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/93672938375.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/63070663531.pdfIn PDF document text
    • http://mfahk.com/upload/files/83236065955.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/42462949799.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/kuranesedirojipa.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/rozodiwejovamepebuteso.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/kememurimewifuzuvi.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/fefenivenutu.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4b68af058932164dff8a10689e810f61/84444138796.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/21958094052.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/xarufazazuwilat.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/bajomogasajaxajalimud.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137df15f04fb---rogobixavi.pdfIn PDF document text
    • https://baongochoa.com/upload/file/ratuxifavotejaxite.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4F 10324 bytes
SHA-256: be365342b47d9590e89e25e292f6b3f014eaa9590d82137ca1d35a8817e39b76
font_01_sfnt_off0000e5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 22560 bytes
SHA-256: 6558d322b90574e19b6344903805b1272c09a5557e41853dbff5417e0e9ffadb
font_02_sfnt_off00012071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1